Zombie

Members of the Zzombiemonster class are undead creatures often found in graveyards or in the main dungeon. Zombies leave corpses that are already old, so they are unfit for sacrificing, and are likely to be tainted even if eaten immediately. You can tin a zombie's corpse to attempt to gain whatever intrinsic would normally be added by consuming a normal corpse of the same monster type. More dangerously, eating Zombie corpse and then curing the sickness is also possible.

Ghouls and skeletons are also represented by Z, but are not technically zombies.

Elf zombies leave oldelfcorpses. These may be tinned and then eaten for the sleep resistance intrinsic, which they have a 67% chance of giving. The high chance comes from the fact that the base level of the elf monster is considerably higher than other base race monsters.

Even in death, the half-dragon zombie retains the half-dragon breath attack it had in life.

Origin

The zombie is a mindless animated corpse. It originates from Haitian folklore. The etymology comes from African or Caribbean creole of related concepts.

The folklore of the Ghoul is a bit unclear, but it is not considered a Zombie.

Encyclopedia entry

The zombi... is a soulless human corpse, still dead, but
taken from the grave and endowed by sorcery with a
mechanical semblance of life, -- it is a dead body which is
made to walk and act and move as if it were alive.
[ W. B. Seabrook ]